a. 32 g b. 8 g c. 16 g d. 4 g 16. The process that changes the identity and number of protons in a nucleus is … a. fusion. b. fission. c. transmutation. d. all of these 17. Artificial radioactive elements are produced by … a. bombarding stable nuclei with particles. b. alpha emission from stable nuclei. c. beta emission from stable nuclei. d. fission of stable nuclei. 18. Which are NOT products of the fission of uranium? a. neutrons b. energy c. medium-weight nuclei d. alpha particles 19. One product of all stellar nuclear fusion reactions is … a. protons. b. electrons. c. energy. d. neutrons. 20. One of the biggest problems surrounding the use of nuclear power plants is … a. finding a way to dispose of spent fuel rods. b. the high cost of coolant needed. c. a lack of uranium. d. initiating a chain reaction in the fuel. 21. At present, fusion reactions… a. cannot be used to produce energy in reactors. b. produce the energy in some nuclear power plants. c. produce the energy in most nuclear power plants. d. produce the energy in all recent nuclear power plants. 22. During nuclear fission, the products have a lower average mass per nucleon because … a. they are less stable. b. they lose neutrons. c. mass is converted to energy. d. energy is converted to mass. 23. Which nuclei are the most stable (have the lowest average mass per nucleon)? a. light elements only b. heavy elements only c. medium-weight elements d. both heavy and light elements
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